Answer: Teritiary sector employment can likey increase in urban areas because, urban areas have larger population witch means that there would be more jobs to support them.
This is why S-waves arrive as secondary waves at the Earth's surface. There is another importantdifference between P-waves and S-waves. Although both can pass through solid rock, only P-waves can also pass through gases and liquids.
Two sides of it will never meet they will just go on forever hope that helps
